![]() Never seemed to get all the way to lowest tick. The icon on the battery seemed to be getting up to the second to last tick before full and would go down a bar and then back up. I stopped at a few stop signs and noticed that the ICE was shutting off and showing that the electric motor was moving the car. Acceleration was back to normal and it was running great. All of the sudden the hybrid battery started to charge up. I thought that was odd so I took off to go around the block. BUT I noticed on the screen the battery icon for the traction battery was showing 2 bars all of the sudden. The ICE fired up right at start up and stayed running. Put the battery back in and the car started up fine again. I tested it with my old school tester (two battery clamps and a toggle switch to put a load on it with a dial) and it showed it was weak and needed a charge, but didn't go into the "Replace" section of the charger so I charged it up for a few hours thinking it was just weak from sitting. ![]() I got it into the shop and took the battery out. The dash had the red triangle on the whole time. VERY slow acceleration, the ICE revved pretty high, and got up to speed after a long time and would hold there but there was definitely something wrong. On the way it displayed what I have read to be a hybrid battery failure. So I decided to give it a shot at taking it home. The prius went to ready mode and then the ICE started and never turned off. I get enough power to at least get the back hatch open and notice that when I took the cables off the honda battery I still had a little bit of a dome light, so I tried to power on again and it worked. So I get a set of cables and attach the honda battery to the yellow top Optima. ![]() That little lever to pop the back hatch under the back cover just doesn't want to pull out. So I try my best to get the back hatch open to get the battery out to take home and charge. but not the Prius!!) That's when I learned my first lesson with the Prius. didn't leave a light on or anything so.I run home to get one of my slim honda batteries that I keep on the shelf in the shop for just this situation (those little batteries fit in everything to get just about any car home!. I thought it was odd being that it was only a week ago and it showed no sign of weakness after sitting for a whole month. So dead that it won't even unlock the door. I show up on Saturday to get it and the 12v battery is dead. I park the car, and tell him I'll be back that weekend to get it. Very slow acceleration, but enough to get me home when I'm ready for it. I wanted to make sure it would at least start and run to get it home (I only live 4 miles away) It turns on and starts up the ICE right away, hybrid battery on the screen shows one bar with no movement when I drive around the block. So I go over a week ago to check on the car. I always wanted to learn more about the hybrid systems, so cheap education right? I told him I'd take it off his hands for scrap price. he parks the car and says he is done with it (227,500 miles). I dropped of my OBD scanner for him and about two weeks later he calls me and says he now has a red triangle with an exclamation point and the OBD throws a code that says "Replace Hybrid Battery" He got it home and said he would look at it later. I asked him what he saw on the dash and he said nothing. I have a friend that had a 2005 Prius for work, he calls me up one day on the road and said it just doesn't want to accelerate. New to hybrids so sorry if some of my terms aren't correct. I'm a hobbyist mechanic and my hobby is to buy older cars, fix them, drive them for awhile and pass them on or just keep driving them.
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